Started implementing config, implemented uninstall flag

src/menu.h

@@ -7,23 +7,23 @@ extern "C" {
 #include <stddef.h>
 
 typedef enum {
-    NMI_MENU_LOCATION_MAIN_MENU = 1,
+    NMI_MENU_LOCATION_MAIN_MENU   = 1,
     NMI_MENU_LOCATION_READER_MENU = 2,
 } nmi_menu_location_t;
 
 typedef struct {
     nmi_menu_location_t loc;
-    const char *lbl;
-    const char *arg;
+    char *lbl;
+    char *arg;
     int (*execute)(const char *arg, char **out_err); // can block, must return 0 on success, nonzero with out_err set to the malloc'd error message on error
-} nmi_menu_entry_t;
+} nmi_menu_item_t;
 
 // nmi_menu_hook hooks a dlopen'd libnickel handle to add the specified menus,
 // and returns 0 on success, or 1 with err_out (if provided) set to the malloc'd
 // error message on error. The provided configuration and all pointers it
 // references must remain valid for the lifetime of the program (i.e. not stack
 // allocated). It MUST NOT be called more than once.
-int nmi_menu_hook(void *libnickel, nmi_menu_entry_t *entries, size_t entries_n, char **err_out);
+int nmi_menu_hook(void *libnickel, nmi_menu_item_t **items, size_t items_n, char **err_out);
 
 #ifdef __cplusplus
 }